A key resource for White that not only provides enough control over the d4-e5 squares, but which also blocks the remaining black bishop.
11... e4c3 This is not the most common idea. 12. b2c3  12... f7f6 Black has no other plan. 13. d1d2 And Praggnanandhaa comes with a logical and strong novelty. The center is now overprotected and the rooks are connected. 13... f5e4 Murzin keeps fighting for the center.